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251 lines
9.1 KiB
C++
251 lines
9.1 KiB
C++
//===-- TargetData.cpp - Data size & alignment routines --------------------==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines target properties related to datatype size/offset/alignment
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// information.
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//
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// This structure should be created once, filled in if the defaults are not
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// correct and then passed around by const&. None of the members functions
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// require modification to the object.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetData.h"
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#include "llvm/Module.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Constants.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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using namespace llvm;
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// Handle the Pass registration stuff necessary to use TargetData's.
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namespace {
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// Register the default SparcV9 implementation...
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RegisterPass<TargetData> X("targetdata", "Target Data Layout");
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}
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static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
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uint64_t &Size, unsigned char &Alignment);
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//===----------------------------------------------------------------------===//
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// Support for StructLayout
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//===----------------------------------------------------------------------===//
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StructLayout::StructLayout(const StructType *ST, const TargetData &TD) {
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StructAlignment = 0;
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StructSize = 0;
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// Loop over each of the elements, placing them in memory...
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for (StructType::element_iterator TI = ST->element_begin(),
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TE = ST->element_end(); TI != TE; ++TI) {
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const Type *Ty = *TI;
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unsigned char A;
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unsigned TyAlign;
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uint64_t TySize;
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getTypeInfo(Ty, &TD, TySize, A);
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TyAlign = A;
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// Add padding if necessary to make the data element aligned properly...
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if (StructSize % TyAlign != 0)
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StructSize = (StructSize/TyAlign + 1) * TyAlign; // Add padding...
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// Keep track of maximum alignment constraint
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StructAlignment = std::max(TyAlign, StructAlignment);
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MemberOffsets.push_back(StructSize);
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StructSize += TySize; // Consume space for this data item
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}
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// Empty structures have alignment of 1 byte.
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if (StructAlignment == 0) StructAlignment = 1;
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// Add padding to the end of the struct so that it could be put in an array
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// and all array elements would be aligned correctly.
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if (StructSize % StructAlignment != 0)
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StructSize = (StructSize/StructAlignment + 1) * StructAlignment;
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}
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//===----------------------------------------------------------------------===//
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// TargetData Class Implementation
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//===----------------------------------------------------------------------===//
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TargetData::TargetData(const std::string &TargetName,
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bool isLittleEndian, unsigned char PtrSize,
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unsigned char PtrAl, unsigned char DoubleAl,
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unsigned char FloatAl, unsigned char LongAl,
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unsigned char IntAl, unsigned char ShortAl,
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unsigned char ByteAl, unsigned char BoolAl) {
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// If this assert triggers, a pass "required" TargetData information, but the
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// top level tool did not provide one for it. We do not want to default
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// construct, or else we might end up using a bad endianness or pointer size!
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//
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assert(!TargetName.empty() &&
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"ERROR: Tool did not specify a target data to use!");
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LittleEndian = isLittleEndian;
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PointerSize = PtrSize;
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PointerAlignment = PtrAl;
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DoubleAlignment = DoubleAl;
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FloatAlignment = FloatAl;
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LongAlignment = LongAl;
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IntAlignment = IntAl;
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ShortAlignment = ShortAl;
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ByteAlignment = ByteAl;
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BoolAlignment = BoolAl;
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}
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TargetData::TargetData(const std::string &ToolName, const Module *M) {
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LittleEndian = M->getEndianness() != Module::BigEndian;
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PointerSize = M->getPointerSize() != Module::Pointer64 ? 4 : 8;
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PointerAlignment = PointerSize;
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DoubleAlignment = PointerSize;
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FloatAlignment = 4;
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LongAlignment = 8;
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IntAlignment = 4;
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ShortAlignment = 2;
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ByteAlignment = 1;
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BoolAlignment = 1;
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}
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static std::map<std::pair<const TargetData*,const StructType*>,
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StructLayout> *Layouts = 0;
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TargetData::~TargetData() {
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if (Layouts) {
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// Remove any layouts for this TD.
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std::map<std::pair<const TargetData*,
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const StructType*>, StructLayout>::iterator
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I = Layouts->lower_bound(std::make_pair(this, (const StructType*)0));
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while (I != Layouts->end() && I->first.first == this)
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Layouts->erase(I++);
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if (Layouts->empty()) {
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delete Layouts;
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Layouts = 0;
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}
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}
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}
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const StructLayout *TargetData::getStructLayout(const StructType *Ty) const {
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if (Layouts == 0)
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Layouts = new std::map<std::pair<const TargetData*,const StructType*>,
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StructLayout>();
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std::map<std::pair<const TargetData*,const StructType*>,
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StructLayout>::iterator
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I = Layouts->lower_bound(std::make_pair(this, Ty));
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if (I != Layouts->end() && I->first.first == this && I->first.second == Ty)
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return &I->second;
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else {
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return &Layouts->insert(I, std::make_pair(std::make_pair(this, Ty),
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StructLayout(Ty, *this)))->second;
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}
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}
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static inline void getTypeInfo(const Type *Ty, const TargetData *TD,
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uint64_t &Size, unsigned char &Alignment) {
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assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");
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switch (Ty->getTypeID()) {
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case Type::BoolTyID: Size = 1; Alignment = TD->getBoolAlignment(); return;
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case Type::VoidTyID:
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case Type::UByteTyID:
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case Type::SByteTyID: Size = 1; Alignment = TD->getByteAlignment(); return;
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case Type::UShortTyID:
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case Type::ShortTyID: Size = 2; Alignment = TD->getShortAlignment(); return;
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case Type::UIntTyID:
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case Type::IntTyID: Size = 4; Alignment = TD->getIntAlignment(); return;
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case Type::ULongTyID:
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case Type::LongTyID: Size = 8; Alignment = TD->getLongAlignment(); return;
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case Type::FloatTyID: Size = 4; Alignment = TD->getFloatAlignment(); return;
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case Type::DoubleTyID: Size = 8; Alignment = TD->getDoubleAlignment(); return;
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case Type::LabelTyID:
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case Type::PointerTyID:
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Size = TD->getPointerSize(); Alignment = TD->getPointerAlignment();
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return;
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case Type::ArrayTyID: {
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const ArrayType *ATy = cast<ArrayType>(Ty);
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getTypeInfo(ATy->getElementType(), TD, Size, Alignment);
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unsigned AlignedSize = (Size + Alignment - 1)/Alignment*Alignment;
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Size = AlignedSize*ATy->getNumElements();
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return;
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}
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case Type::StructTyID: {
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// Get the layout annotation... which is lazily created on demand.
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const StructLayout *Layout = TD->getStructLayout(cast<StructType>(Ty));
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Size = Layout->StructSize; Alignment = Layout->StructAlignment;
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return;
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}
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default:
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assert(0 && "Bad type for getTypeInfo!!!");
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return;
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}
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}
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uint64_t TargetData::getTypeSize(const Type *Ty) const {
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uint64_t Size;
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unsigned char Align;
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getTypeInfo(Ty, this, Size, Align);
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return Size;
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}
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unsigned char TargetData::getTypeAlignment(const Type *Ty) const {
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uint64_t Size;
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unsigned char Align;
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getTypeInfo(Ty, this, Size, Align);
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return Align;
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}
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/// getIntPtrType - Return an unsigned integer type that is the same size or
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/// greater to the host pointer size.
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const Type *TargetData::getIntPtrType() const {
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switch (getPointerSize()) {
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default: assert(0 && "Unknown pointer size!");
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case 2: return Type::UShortTy;
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case 4: return Type::UIntTy;
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case 8: return Type::ULongTy;
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}
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}
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uint64_t TargetData::getIndexedOffset(const Type *ptrTy,
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const std::vector<Value*> &Idx) const {
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const Type *Ty = ptrTy;
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assert(isa<PointerType>(Ty) && "Illegal argument for getIndexedOffset()");
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uint64_t Result = 0;
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generic_gep_type_iterator<std::vector<Value*>::const_iterator>
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TI = gep_type_begin(ptrTy, Idx.begin(), Idx.end());
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for (unsigned CurIDX = 0; CurIDX != Idx.size(); ++CurIDX, ++TI) {
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if (const StructType *STy = dyn_cast<StructType>(*TI)) {
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assert(Idx[CurIDX]->getType() == Type::UIntTy && "Illegal struct idx");
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unsigned FieldNo = cast<ConstantUInt>(Idx[CurIDX])->getValue();
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// Get structure layout information...
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const StructLayout *Layout = getStructLayout(STy);
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// Add in the offset, as calculated by the structure layout info...
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assert(FieldNo < Layout->MemberOffsets.size() &&"FieldNo out of range!");
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Result += Layout->MemberOffsets[FieldNo];
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// Update Ty to refer to current element
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Ty = STy->getElementType(FieldNo);
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} else {
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// Update Ty to refer to current element
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Ty = cast<SequentialType>(Ty)->getElementType();
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// Get the array index and the size of each array element.
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int64_t arrayIdx = cast<ConstantInt>(Idx[CurIDX])->getRawValue();
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Result += arrayIdx * (int64_t)getTypeSize(Ty);
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}
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}
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return Result;
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}
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